from django.shortcuts import render
from rest_framework.viewsets import ReadOnlyModelViewSet
from rest_framework_extensions.cache.mixins import CacheResponseMixin

from .models import Area
from .serializers import AreaSerializer, SubAreaSerializer


class AreasViewSet(CacheResponseMixin, ReadOnlyModelViewSet):
    """行政区划信息"""
    pagination_class = None  # 列表行为不分页，区划信息不分页

    def get_queryset(self):
        """提供数据集"""
        if self.action == 'list':
            return Area.objects.filter(parent=None)
        else:
            return Area.objects.all()

    def get_serializer_class(self):
        """提供序列化器"""
        if self.action == 'list':
            return AreaSerializer
        else:
            return SubAreaSerializer
